The Smith-VictorBH2 Metal Alloy Ball Head is a rugged and well-designed ballhead. It is rated to support up to 18 lb, and is ideal for use with pro SLR cameras with pro zoom lenses attached. All knobs feature a comfortable knurled rubber gripping surface. In addition to the large single-action locking knob, the BH2 also features two smaller knobs. One controls the 360° panning control, and the other the amount of ball friction.